Means for damping the rolling motion of ships.



H. FRAHM. MEANS FOR DAMPING THE ROLLING MOTION 0F SHIBSL v A PPLIOATION FILED JULY 6,1911. 4 1,007,348.

' Patented Oct. 31, 1911.

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MEANS FOR DAMPING THE ROLLING MOTION 0F SHIPS.

APPLICATION FILED JULYG, 1911.

1,007,348, Patented Oct. 31, 1911.

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HERMANN FRAI-IM, OF HAMBURG, GERMANY.

MEANS FOR DAMPING THE ROLLING MOTION OF SHIPS.

Specification of Letters Patent.

Application filed July 6, 1911.

Patented Oct. 31, 1911. Serial No. 637,234.

To all whom it may concern:

Be it known that I, HERMANN FRAHM, a citizen of the free town of Hamburg, and resident of 18 Kloster Allee, in the free town of Hamburg, German Empire, ongineer, have invented certain new and useful Improvements in Means for Damping the Rolling Motion of Ships, of which the following is a specification.

This invention relates to an improved means for damping the rolling motion of ships and is an improvement in or modification of the means described in the specification of my prior United States Patent No. 970,368 of September 13, 1910, in which water is inclosed in a water chamber arranged transversely in the ship, said water chamber being of U-shaped form comprising side tanks connected together by a conduit.

The object of the present invention is to prevent the tossing and impact of water flowing from one side tank to the other and for obtaining a uniform rise of water in the side tanks without the formation of eddying currents.

According to this invention I provide means whereby the water in the water chamber is guided in its passage from one side tank to the other in such a manner as to divide the water into a plurality of streams and to guide the water in an upward direction in the side tanks. For this purpose I preferably employ bent metal plates inserted in the side tanks in proximity to the con nection of the conduit therewith. These guide plates are particularly effective when the type of ship necessitates the side tanks to be of comparatively large dimensions transversely of the ship, such as for example may be the case when the water chamber is fitted into a ship already built. These guide plates divide the whole water chamber into a number of individual chambers fitting the one within another.

In order that the invention may be more clearly understood, reference is made to the accompanying drawings, which show dia-' grammatically the preferred method of carrying out my invention.

Figure 1 is a sectional view through the ship having a water chamber of the type described fitted therein after the ship has been constructed, and showing my invention applied thereto. Fig. 2 is a plan view of Fig. 1. Fig. 3 is a sectional view of a ship in which the water chamber has been fitted in position during the construction of the ship and shows my invention applied thereto. Fig. 4c is a detail section showing means for adjusting the guide-plates.

a indicates the outline of a ship and b (Fig. 1) the upper deck upon which is arranged the water chamber comprising two side-tanks 0 and (5 connected together below by a water-conduit e and above by air-conduits f fitted with throttle valves 9. The water chamber is provided with run-01f pipes in adapted to be controlled by means of valves 70 operated from the valve rods Z.

According to this invention angular guideplates m, having rounded corners are inserted in the lower part of the side-tanks c and (Z where the conduit 6 joins the sidetanks. These guide-plates subdivide the water, which owing to the rolling of the ship flows from one side-tank to the other into a number of streams or currents and deviates these currents upwardly in the side-tanks c and cl, whereby the formation of eddies and impacts is obviated.

Fig. 3 of the drawings shows a slight modification of Fig. 1, in which the air conduit f is dispensed with and the side tanks 0 and d left open at the top. In this figure the guide-plates m are shown of curved form.

It will of course be readily understood that the guide-plates 172. may be made adjustable, if desired, as for example is shown in Fig. 4, in which the straight part m of the guide-plates is arranged to slide at each end in slotted guides n. The guide-plates m are adapted to be adjusted in position by means of screws 0 passing through internally screwed bosses p on the frame plate 1" of the water chamber, said screws 0 being operable by means of handles 8. The water chamber may of course be of any desired construction such as is shown in the specification of my prior United States Patent No. 970,368.

I claim 1. In a ship having a U-shaped water chamber arranged transversely thereof and comprising side tanks connected together by a water conduit, said water chamber being adapted to damp the rolling motions of the ship; means for preventing impacts and disturbation of the water in the water chamber during the rolling motion of the ship and for effecting a uniform rise of the water in the side-tanks, comprising guiding means adapted to divide the water flowing from the water conduit into the side tanks into a plurality of streams and to direct the water upwardly in the side tanks.

2. In a ship having a U-shaped water chamber arranged transversely thereof and comprising side tanks connected together by a water conduit, said water chamber being adapted to damp the rolling motions of the ship; means for preventing impacts and disturbation of the water in the water chamber during the rolling motion of the ship and for effecting a uniform rise of the water in the side tanks, comprising bent guide-plates adapted to divide the water flowing from the water conduit into the side tanks into a plurality of streams and said bent guideplates directing the water upwardly in the side tanks.

3. In a ship having a U-shaped water chamber arranged transversely thereof and comprising side tanks connected together by a water conduit, said water chamber being adapted to damp the rolling motions of the ship; means for preventing impacts and disturbation of the water in the water chamber during the rolling motion of the ship and for effecting a uniform rise of the water in the side tanks, comprising angular guideplates having rounded corners adapted to divide the water flowing from the water conduit into the side tanks into a plurality of streams and said guide plates directing the water upwardly in the side tanks.

4. In a ship having a U-shaped water chamber arranged transversely thereof and comprising side tanks connected together by a water conduit, said water chamber being adapted to damp the rolling motions of the ship; means for preventing impacts and disturbation of the water in the water chamber during the rolling motion of the ship and for efi'ecting a uniform rise of the water in the side tanks, comprising bent guide-plates adapted to divide the water flowing from the water conduit into the side-tanks into a plurality of streams and said bent guideplates directing the water upwardly in the side tanks, and means for adjusting the position of said guide-plates.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

HERMANN FRAHM.

Witnesses:

CORINNE MYERS, VERA PAULSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents, Washington, D. C. 

